In this paper a Morse Theory for lightlike geodesics joining a point with a timelike curve is obtained on a stably Causal space-times with boundary. Some applications to the multiple image effect are presented. In particular, we give some conditions on the geometry and the topology of space-time, in order that the number of images in the gravitational lens effect is infinite or odd.
|Titolo:||A Morse Theory for light rays on stably causal Lorentzian manifolds|
|Data di pubblicazione:||1998|
|Appare nelle tipologie:||1.1 Articolo in rivista|